CAMPBELL 



W&* 



bl 





21 





bl 



.;*...- '■**.•. 



23 



A£- 



25 



22 



bl 



28 



2G 



27 



' 



bl 



3 " 



29 



3 







■ V 



• 



-_ 





30 







.V 







21-29. Spermatogenesis in Ophioglossum pendulum. X 950; 21 shows 34-37 

 spermatocyte before final nuclear division, with two 

 blepharoplasts, bl; 22, 23, nuclear spindle from side and 

 pole; 24-29, development of spermatozoid ; n, nucleus of 

 spermatozoid ; c, cilia; u, protoplasmic vesicle. 



30-32. Three stages in development of archegonium of O. pendulum. 

 X 275. b, basal cell; nl, n-, neck canal cells. 

 33. Venter of archegonium showing apparently a ventral canal cell, 0. 

 n, one of the nuclei of the neck canal cell. X 650. 



44. 



45, 



46-48 



Spermatogenesis in B. virginianum; 38-41, in Kaul/ussia; 



42, 43, in Danaea. All X 950. 

 Nearly ripe spermatozoids of Angiopteris. X 950. n, nucleus ; 



bl, blepharoplast; c, cilia; u, vesicle. 

 Nearly ripe archegonium of Danaa, showing apparent ventral 



canal cell, v. 

 Recently fertilized egg-cells of Danaa. sp, spermatozoid (?) 



within the egg-nucleus. 



